2.1. Large and Small Eddies

Try these first

1. 1.

   What does LES stand for?

   Hint

   Think about the eddies in turbulence.

2. 2.

   Are small eddies captured directly in LES?

   Hint

   Remember the characteristics of large vs. small eddies.

3. 3.

   What technique does LES utilize to capture large eddies?

   • Direct Numerical Simulation
   • Reynolds Averaged Navier-Stokes
   • Filtering

   Hint

   Consider how we separate scales in simulations.

4. 4.

   Small eddies exhibit universal behavior according to which hypothesis?

   • True
   • False

   Hint

   Think about the significance of universal behaviors in turbulence.

5. 5.

   If a researcher wishes to improve their LES model, what changes could they consider in their grid setup to enhance resolution without increasing computation too much?

   Hint

   Look at how grid size influences capture of eddies.

6. 6.

   How does understanding the energy cascade help in practical applications of fluid dynamics in engineering?

   Hint

   Think about real-world implications of turbulence understanding.